Function state_home_dir

A base directory relative to which user-specific state data should be written.

An application appid would typically be expected to write its state data to {state_home_dir}/{appid}/**/*.

Common kinds of state data include actions history (such as logs, history, recently used files, etc.) and state of the application that can be reused after application restart (such as view, layout, open files, undo history, etc.).